package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.CustomException;
import com.itheima.reggie.dto.SetmealDto;
import com.itheima.reggie.entity.Setmeal;
import com.itheima.reggie.entity.SetmealDish;
import com.itheima.reggie.mapper.SetmealMapper;
import com.itheima.reggie.service.SetmealDshService;
import com.itheima.reggie.service.SetmealService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;
import java.util.stream.Collectors;

@Service
@Slf4j
public class SetmealServiceImpl extends ServiceImpl<SetmealMapper, Setmeal> implements SetmealService{
    @Autowired
    private SetmealDshService setmealDshService;

    /**
     * 新增套餐，同时需要保存套餐和菜品的关联关系
     * @param setmealDto
     */
    @Transactional
    public void saveWithDish(SetmealDto setmealDto) {
        //保存套餐的基本信息,操作setmeal,执行insert操作
        this.save(setmealDto);
        List<SetmealDish> setmealDishes = setmealDto.getSetmealDishes();
        setmealDishes.stream().map(item->{
            item.setSetmealId(setmealDto.getId());
            return item;
        }).collect(Collectors.toList());
        //保存套餐和菜品的关联信息,操作setmeal_dish,执行insert操作
        setmealDshService.saveBatch(setmealDishes);

    }

    /**
     * 删除套餐，同时需要删除套餐和菜品的关联数据
     * @param ids
     */
    @Transactional
    public void removeWithDish(List<Long> ids) {
        //select count(*) from setmeal where id in (1,2,3) and status = 1
        //查询套餐状态，确定是否可用删除
        LambdaQueryWrapper<Setmeal> lqw=new LambdaQueryWrapper<>();
        lqw.in(Setmeal::getId,ids);
        lqw.eq(Setmeal::getStatus,1);

        int count = this.count(lqw);
        if (count>0){
            //如果不能删除，抛出一个业务异常
            throw new CustomException("套餐正在售卖中，不能删除");
        }
        //如果可以删除，先删除套餐表中的数据---setmeal
        this.removeByIds(ids);

        //delete from setmeal_dish where setmeal_id in (1,2,3)
        LambdaQueryWrapper<SetmealDish> dishLqw=new LambdaQueryWrapper<>();
        dishLqw.in(SetmealDish::getSetmealId,ids);
        setmealDshService.remove(dishLqw);
    }
    /**
     * 根据套餐id修改状态
     * @param ids
     */
    @Override
    public void updateStatusById(Integer status, List<Long> ids) {
        LambdaQueryWrapper<Setmeal> lqw=new LambdaQueryWrapper<>();
        lqw.in(ids !=null,Setmeal::getId,ids);
        List<Setmeal> list = this.list(lqw);
        for (Setmeal setmeal : list) {
            if (setmeal!=null){
                setmeal.setStatus(status);
                this.updateById(setmeal);
            }
        }
    }


    /**
     * 回显套餐数据,根据id查询套餐
     * @param id
     */
    @Override
    public SetmealDto getData(Long id) {
        Setmeal setmeal=this.getData(id);
        SetmealDto setmealDto=new SetmealDto();
        LambdaQueryWrapper<SetmealDish> lqw=new LambdaQueryWrapper<>();
        lqw.eq(id!=null,SetmealDish::getSetmealId,id);
        if (setmeal!=null){
            BeanUtils.copyProperties(setmeal,setmealDto);
            List<SetmealDish> list = setmealDshService.list(lqw);
            setmealDto.setSetmealDishes(list);
            return setmealDto;
        }
        return null;
    }
}
